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Paper   IPM / CMNL / 14880
Condensed Matter National Laboratory
  Title:   Bubble generation in liquid rope coiling
1.  Hossein Hosseini
2.  Ali Farnudi
3.  Mohammad Hassan Khatami
4.  Mehdi Habibi
  Status:   Published
  Journal: RSC Adv.
  Vol.:  6
  Year:  2016
  Pages:   105469-105475
  Editor:  Mike D Ward
  Publisher(s):   Royal Society of Chemistry
  Supported by:  IPM
We present an experimental study of liquid rope coiling in order to explore different possibilities of air bubble generation in a viscous fluid. A column of viscous fluid falling on a smooth solid surface exhibits different behaviours, e.g., axisymmetric stagnation flow, coiling, rotatory folding, supercoiling, etc. These states provide ample opportunity for air to get trapped inside the body of a fluid. We investigate bubble generation mechanisms by studying the instability of a falling fluid rope and the characteristics of the observed bubbles. Our experiments show that a viscous rope undergoing supercoiling on the impact surface can, at times, produce a four-branched spiral pattern of bubbles. Finally, we provide a phase diagram illustrating the bubble properties relevant to the flow rate and fall height of the viscous jet. Our study provides a very simple method for the generation of mono/bi-dispersed bubbles in viscous fluids at high rates with an ability to tune the bubble size.

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